13th century
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Yes. 1223 is a prime number.
There are 0.3048 metres in one foot. Therefore, rounded to two decimal places, 1223 metres is equal to 1223/0.3048 = 4012.47 feet.
MCCXXIII
I thinks it's 1223 km. There's 5,280 feet in a mile, so if there's 760 miles, you multiply 760 by 5280 to get 4,012,800. Then you divide that by how many feet are in a kilometer, which is 3,280, to get a total of 1223 km. :)
708 multiplied by 128 equals 90,624.